Jun 14

Jun 14 - Jun 15

Richland Regatta

VINTAGE-INB

Columbia River

Richland , WA

Jun 14 - Jun 15

2025 Joe Whetstone Memorial Grea...

MOD-SO-J CLSES

Saint Joseph River

Constantine, MI

Jun 20

Jun 20 - Jun 21

Shootout Offshore

OS

Lake of the Ozarks

Lake Ozark, MO

Jun 20 - Jun 22

COA Annual Thompson Regatta

PRO-MOD-SO-J CLSES

West Thompson Lake

Thompson, CT

Jun 21

Jun 21 - Jun 22

Celina Governors Cup

VINTAGE-INB

Grand Lake St. Marys

Celina, Ohio , OH

Jun 21 - Jun 22

SYRACUSE VINTAGE RACEBOAT REGATT...

VINTAGE;N

ONONDAGA LAKE - WILLOW BAY

LIVERPOOL, NY

Jun 21 - Jun 22

Entiat Vintage Raceboat Regatta

VINTAGE-INB

Lake Entiat

Entiat, WA

Jun 21 - Jun 22

2025 APBA Modified Central Divis...

MOD;R-MOD;D-PRO-KPH-SO-J CLSES

St. Joesph River

Constantine, MI, MI

Jun 21 - Jun 22

APBA PRO EASTERN DIVISIONALS

PRO-KPH

Wisconsin River

Wausau, WI

Jun 21

Webbs Slough Jet Sprint Boat Ra...

JET SPRI

Webbs Slough

Saint John, WA

Jun 21 - Jun 22

Sherri Hathaway Memorial Regatta

SO;D-PRO-KPH-MOD-J CLSES

Cullaby Lake

Warrenton, OR

Jun 25

Jun 25 - Jun 29

Louisiana Offshore Grand Prix

OS;N

Lake Pontchartrain

Metairie, LA

Jun 28

Jun 28 - Jun 29

LAKE VERMILION THUNDER HOSTED BY...

MOD-SO-J CLSES

Lake Vermilion

Danville, IL

Jun 28 - Jun 29

50th Annual Idaho Regatta

INB-SO-OPC-J CLSES

Snake River

Burley, ID

Jul 4

Jul 4 - Jul 3

4th of July Boat Races

SE

Zimovia Strait

Wrangell, AK

Jul 5

Jul 5 - Jul 6

2025 Madison Regatta

INB-UNL

Ohio River

Madison, IN

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Modified Outboard Menu

Modified Outboard

Modified-Outboard

MOD racers aren't afraid to get their hands dirty - The goal in this category is to pull every last bit of horsepower out of your engine. In Modified Outboard, the engine builder's skill is just as important as the driver's. These boats are easily recognizable by their specially tuned pipes that make them as loud as they are fast. Because engines are constantly being modified to make the absolute most of what the rules allow, the competition is always fierce. Join the ranks of some of the best engine builders in the world, join Modified Outboard Racing.

Whether hydroplane or runabout, Modified classes are defined by the size of their engines (displacement). The numbers in the class names give you the approximate engine size in cubic centimeters. The 250ccMH, or 250 cubic centimeter Mod Hydro, is smaller than the 850ccMH, or 850 cubic centimeter Mod Hydro. Some classes have minimum weights, which increase with engine size. The smaller classes are often a good fit for younger, lighter drivers (14-year-olds may drive 200-250cc Mod classes, for example). The larger classes take considerable skill and experience. Propellers of four blades or less are used, and your prop choice can affect your speed enormously.

Modified Outboard Resources

Modified Outboard Classes